Uncommon BrillianceEvery Astor by Blue Nile™ diamond begins with premium quality rough with as few impurities or inclusions as possible. Each diamond is hand selected and guaranteed to have no inclusions visible to the naked eye. Only 1 of every 1,000 diamonds qualifies as an Astor by Blue Nile™ diamond.

CUT

Stringent StandardsThe cut parameters of an Astor by Blue Nile™ diamond are among the most demanding in the industry. Diamonds cut even slightly out of proportion may yield a higher carat weight, but lose brilliance. In order to get the sparkle of an Astor by Blue Nile™ diamond, up to 74% of the diamond rough is sacrificed.

EVALUATION

Graded and CertifiedOnly diamonds with the highest brilliance, fire, and sparkle are considered Astor by Blue Nile™ worthy. Each diamond is graded by the Gemmological Institute of America for quality and certified by GemEx for light performance.

SPARKLE

The Astor by Blue Nile™ DifferenceThe Astor by Blue Nile™ diamond's guaranteed sparkle is a result of scouring the globe for the finest raw material, precision cutting, and rigorous quality requirements to ensure it captivates the eye and becomes the focal point of your shared promise.